Convert Pass()→std::move() in //chrome

chrome/browser/tracing/chrome_tracing_delegate.cc

Index: chrome/browser/tracing/chrome_tracing_delegate.cc
diff --git a/chrome/browser/tracing/chrome_tracing_delegate.cc b/chrome/browser/tracing/chrome_tracing_delegate.cc
index a7467f95daf117e048b025c3eaad3fb5b10adc47..0548ae142e345c4eac878d8a6f32577ef9c5eb0b 100644
--- a/chrome/browser/tracing/chrome_tracing_delegate.cc
+++ b/chrome/browser/tracing/chrome_tracing_delegate.cc
@@ -4,6 +4,8 @@
 
 #include "chrome/browser/tracing/chrome_tracing_delegate.h"
 
+#include <utility>
+
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/time/time.h"
@@ -150,7 +152,7 @@ void ChromeTracingDelegate::GenerateMetadataDict(
   for (const auto& it : variations)
     variations_list->Append(new base::StringValue(it));
 
-  metadata_dict->Set("field-trials", variations_list.Pass());
+  metadata_dict->Set("field-trials", std::move(variations_list));
 }
 
 content::MetadataFilterPredicate